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Old 03-11-09, 12:38 AM   #1
Sirrus Rider
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8 Speed Shimano Sora durability

I have an '07 Sirrus that is bone stock with a Shimano Sora drive train. It seems like in compared to my older 6 speeds (Shimano 105 and Deore) it has no durability. I replaced the chain and rear cogset at 853 miles and it had begun slipping again after 400 miles. The bikes that have 105 and Deore ran their original drivetrain for YEARS before the Deore drive train needed chainwheels and a cogset. Is my story unique? I'm lubing my chain with Triflow and flushing it out and relubing every third ride. I also used Pedro's Ice Wax for a time, but went back to Triflow as it seems to last longer..
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Old 03-11-09, 01:21 AM   #2
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Seems unique. Shimano's low-end cassettes are still made of steel and should wear pretty durably. Maybe there was something that happened to cause the chain to wear out quickly (i.e., "stretching"). Or maybe you just got a lemon chain?
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Old 03-11-09, 05:56 AM   #3
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I have 7,768 miles on my Sora 8-speed bike and have had no problems with the drive train. I replaced the chain at around 3,500 miles or so. It's still running and shifting with no issues.
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Old 03-11-09, 07:53 AM   #4
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Quote:
Originally Posted by Sirrus Rider View Post
I replaced the chain and rear cogset at 853 miles and it had begun slipping again after 400 miles. ..
Something is seriously wrong with your bike, or it's adjustments. Shimano's current parts are much more durable than that.

I routinely get 6000 miles on a 9-speed Shimano chain/ 105 level cassette and they are rumored to be less durable than 8-speed.

What do you mean "flushing it out every third ride"? Are you solvent washing the chain that often? You are doing far more harm than good with that procedure.
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